:拖拉紅點令到

A' B' = ABB'C' = BCC'A' = CA

慢慢地將兩點綠點拖拉到一起,在電腦作出一個紅色的rA'B'C'

比較 rABC rA'B'C'。你是否能夠作出一個不全等於 rABC rA'B'C'

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